The following thoughts are based on a post I wrote in 2013 in another thread about a knee injury that included a full rupture of the ACL. It's a good one to read for those who are leaning towards ACL reconstruction surgery.
https://www.theskidiva.com/forums/index.php?threads/complete-acl-rupture.15988
There is a lot more to a knee than the ACL. Someone who tears/ruptures an ACL
and does major damage to other ligaments and/or the meniscus is in a completely different situation than someone who blows an ACL but has no pain, no other significant damage to other parts of the knee, and no instability incidences. Assuming both patients get a full diagnosis soon after injury, are consulting knee specialists, and are being careful to avoid further damage. Ongoing pain is bad . . . period. How someone with a bad knee opts to treat the problem is a very personal decision that should take into account life style as much as medical advice from a specialist who has manipulated the injured knee and the MRI.
The ACL is the only ligament completely internal to the knee. As a result, it gets little blood flow. That's why a torn MCL can heal, given enough time, but an ACL is much less likely to heal. That's why surgery to re-attach a torn ACL did not turn out to be a useful surgical technique. ACL reconstruction surgery is invasive, requires drilling holes in bones, and requires a lengthly healing phase (months, not weeks) before the final stages of PT and unrestricted activity can resume. Certainly well worth it for certain cases. In others, perhaps as much as 10%, revision surgery is required or there are long term issues. The decision about ACLr surgery should not be rushed when there is no pain and no instability IMHO. Try to think longer term, not just the next six months or next ski season, but more the next 10 years, or even the next 20-30 years.
I was in my 50's when I blew an ACL in June (not skiing). My parents were going strong physically at age 90. That was a factor in my decision to work at being a coper for at least a year first. I was willing to adjust my skiing for a season if needed. It took at least six months for the meniscus tear (red-red zone) to heal without intervention. Had I still wanted to play tennis or volleyball, my decision would probably have been different. I was skiing about seven months after injury, three months after finishing with formal PT.Getting an MRI shortly after the initial swelling goes down is well worth it if there are strong indications that the ACL was torn. Starting formal PT within days or at most a few weeks of messing up a knee is highly recommended.
Ultimately, your ortho surgeon is the best source of advice for
your situation.
The bottom line is that popping off an ACL definitely does not mean the end of skiing. My on-going thread about skiing better than ever as a coper is
here.